Rotary cutter



Aug. 21, 1928.

F. P. Mil-LER ROTARY CUTTER Filed May 16, 1925 .mvENToR Md: Pldlef;

l ATTORNEY Patented. Aug. 21, 1928.

UNITEDv STATES FRANK r. MILLER, or MEADVILLE, PENNSYLVANIA.

ROTARY CUTTER.

' application med may 16,1925. serial No. 30,782.

This invention relates to rotary cutters such as milling cutters, reamers, tool holders for lathes, counterbores and the like, and has for an important object the provision of simple and easily adjusted means for holding the blades rigidly in place during the use of the same.

More specifically, the invention forming the subject of this application aims to provide a rotary cutter in which the blades are securely held against endwise and edgewise shifting by the simple adjustment of a set screw for each blade, the setsCrew being at all times accessible for engagement by a screw-driver or other tool.

Other objects and advantages will be apparent during the course of the following description. 4

ln the accompanying drawing forming a part of this application and in which like numerals are employed to designate lile parts throughout the same,

Figure 1 is a fragmentary .perspective of a milling cutter Aembodying the invention;

Figure 2 is a detail vertical sectional view through the same;

Figure 3 is a group perspective illustrating a blade and the holding means therefor;

Figure l is a detail sectional view taken on line 4--4 of Figure 2;

Figure 5 is a side elevation of a reamer embodying the invention.

7 In the drawing wherein for the purpose of illustration is shown a. preferred embodiment of the invention the numeral 10 designates a millin cutter body provided with an annular series of slots 11 for the reception of blades 12 and wedge blocks 14. Figure 1 plainl illustrates that one side face of each bla e 12 and the adjacent wall of the groove or slot 11 is provided' with angularly extending, interfitting teeth or serrations 16..

Attention is directed to Figures 1 and 3 which illustrate that the tapered wedge block 14 is provided intermediate the ends thereof with a transverse rib or boss 18 inu teriorly threaded for the reception of an adjusting screw 20. The adjusting screw 2O is rovided at the inner end thereof with a reriluced contact portion' 22 which bears against' the inner end wall of a groove 26 and thereby forces the tapered wedge block 14 outwardly into binding engagementwith the blade. It will be seen that when the tapered wedge block 14 is forced outwardly n 1,681,675 PATENT(l OFFICE.

tessera by the turning of the screwY 20 the serrations 16 will besecurely interlocked with each other so that the blade is positively held against endwise and edgewise movement.

It will be seen that the block 14 is held against endwise movement by the boss 18 which is snugly received in the groove 26 in one side wall of the slot. This also greatly expedites the assembling of the cutter as well as holding the block against endwise movement during the use of the cutter.

Figure 2 illustrates that the set screw 20 exerts a thrust substantially parallel to the blade l2 and consequently the wedge 14 may have flat engagement throughout with the opposed side of the blade l2. In other words, uniform pressure contact between the wedge and the blade results from the tightening of the set screw 20.

'Figure 5 illustrates the invention carried out in connection with a reamer, the body 5() of which is slotted for the reception of blades 51. The Wedge blocks 52, which may be of any length, are forced outwardly into binding engagement with the blades 51 by the set screws 54: in the manner described in connection with the milling cutter.

In summarizing it-will be seen that the invention forming the subject matter of this application is in the nature lof a body or holder having a slot within which the work engaging member consisting o f the sections 12 and 14 is positioned and that one of the sections, viz, the lsection 14, is increased in width toward the inner edge thereof so that the thrust of the substantially radial fastener 20will force the section 14 out-- wardly into uniform pressure contact with the other section whereby the work engaging member is firmly held in place.

The invention is capable of a variety of contact, the wedge being provided with a boss, anda screw threaded through the boss substantially parallel to the plane of the blade and engaging the bottom wall of the slot to urge the wedge outwardl whereby one side of the wedge is flatly 1n binding engagement throughout with the opposed side of the blade.

` 2. A cutter comprising a body having a slot, a blade and a wedge in the slot and having the opposed sides thereof flatly in Contact, an adjusting screw having threaded engagement with the wedge and bearing boss substantially parallel tothe plane of the blade and engagin the slot to urge the we ge outwardly whereby one surface of the same has uniform pressure Contact with the opposed side of said blade, one side of said slot being grooved to snugly receive said boss.

5. A cutter comprising a body having a slot, a work engaging member in said slot the bottom Wall of and consisting of Separate sections, one of v which increases in width toward the inner edge thereof, and a fastener having thread# ed engagement with one of the sections and bearing against the bottom wall' of the slot to force that section outwardly into uniform pressure engagement with the other section, the position and the thrust of said fastener being substantially parallel to the plane of one of said sections.

In testimony whereof I affix my signature.

FRANK P. MILLER. 

